Why Are Mules Sterile?

A mule is a not a species, but a hybrid of a horse and a donkey. Mules don’t reproduce because horses and donkeys have different numbers of chromosomes, but that doesn’t really tell us much. SciShow explains why those chromosomes can pair up for one generation, but not two. Still, while mules are at a disadvantage in producing their own genetic descendants, they make pretty good surrogate mothers.

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Source: neatorama

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